In-plane magnetic penetration depth in Sr_2RuO_4: muon-spin rotation/relaxation study

We report on measurements of the in-plane magnetic penetration depth (\lambda_{\rm ab}) in single crystals of Sr_2RuO_4 down to \simeq 0.015 K by means of muon-spin rotation/relaxation. The linear temperature dependence of \lambda^{-2}_{\rm ab} for T\lesssim 0.7 K suggests the presence of nodes in the superconducting gap. This statement is... Show more